118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/assert.h"
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#include "core/file_sys/vfs.h"
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#include "mbedtls/cipher.h"
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namespace Crypto {
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enum class Mode {
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CTR = MBEDTLS_CIPHER_AES_128_CTR,
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ECB = MBEDTLS_CIPHER_AES_128_ECB,
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XTS = MBEDTLS_CIPHER_AES_128_XTS,
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};
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enum class Op {
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ENCRYPT,
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DECRYPT,
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};
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template <typename Key, size_t KeySize = sizeof(Key)>
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struct AESCipher {
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static_assert(std::is_same_v<Key, std::array<u8, KeySize>>, "Key must be std::array of u8.");
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static_assert(KeySize == 0x10 || KeySize == 0x20, "KeySize must be 128 or 256.");
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AESCipher(Key key, Mode mode) {
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mbedtls_cipher_init(&encryption_context);
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mbedtls_cipher_init(&decryption_context);
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ASSERT_MSG((mbedtls_cipher_setup(
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&encryption_context,
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mbedtls_cipher_info_from_type(static_cast<mbedtls_cipher_type_t>(mode))) ||
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mbedtls_cipher_setup(&decryption_context,
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mbedtls_cipher_info_from_type(
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static_cast<mbedtls_cipher_type_t>(mode)))) == 0,
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"Failed to initialize mbedtls ciphers.");
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ASSERT(
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!mbedtls_cipher_setkey(&encryption_context, key.data(), KeySize * 8, MBEDTLS_ENCRYPT));
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ASSERT(
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!mbedtls_cipher_setkey(&decryption_context, key.data(), KeySize * 8, MBEDTLS_DECRYPT));
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//"Failed to set key on mbedtls ciphers.");
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}
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~AESCipher() {
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mbedtls_cipher_free(&encryption_context);
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mbedtls_cipher_free(&decryption_context);
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}
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void SetIV(std::vector<u8> iv) {
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ASSERT_MSG((mbedtls_cipher_set_iv(&encryption_context, iv.data(), iv.size()) ||
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mbedtls_cipher_set_iv(&decryption_context, iv.data(), iv.size())) == 0,
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"Failed to set IV on mbedtls ciphers.");
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}
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template <typename Source, typename Dest>
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void Transcode(const Source* src, size_t size, Dest* dest, Op op) {
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size_t written = 0;
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const auto context = op == Op::ENCRYPT ? &encryption_context : &decryption_context;
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mbedtls_cipher_reset(context);
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if (mbedtls_cipher_get_cipher_mode(context) == MBEDTLS_MODE_XTS) {
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mbedtls_cipher_update(context, reinterpret_cast<const u8*>(src), size,
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reinterpret_cast<u8*>(dest), &written);
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if (written != size)
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LOG_WARNING(Crypto, "Not all data was decrypted requested={:016X}, actual={:016X}.",
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size, written);
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} else {
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const auto block_size = mbedtls_cipher_get_block_size(context);
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for (size_t offset = 0; offset < size; offset += block_size) {
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auto length = std::min<size_t>(block_size, size - offset);
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mbedtls_cipher_update(context, reinterpret_cast<const u8*>(src) + offset, length,
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reinterpret_cast<u8*>(dest) + offset, &written);
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if (written != length)
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LOG_WARNING(Crypto,
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"Not all data was decrypted requested={:016X}, actual={:016X}.",
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length, written);
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}
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}
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mbedtls_cipher_finish(context, nullptr, nullptr);
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}
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template <typename Source, typename Dest>
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void XTSTranscode(const Source* src, size_t size, Dest* dest, size_t sector_id,
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size_t sector_size, Op op) {
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if (size % sector_size > 0) {
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LOG_CRITICAL(Crypto, "Data size must be a multiple of sector size.");
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return;
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}
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for (size_t i = 0; i < size; i += sector_size) {
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SetIV(CalculateNintendoTweak(sector_id++));
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Transcode<u8, u8>(reinterpret_cast<const u8*>(src) + i, sector_size,
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reinterpret_cast<u8*>(dest) + i, op);
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}
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}
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private:
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mbedtls_cipher_context_t encryption_context;
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mbedtls_cipher_context_t decryption_context;
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static std::vector<u8> CalculateNintendoTweak(size_t sector_id) {
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std::vector<u8> out(0x10);
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for (size_t i = 0xF; i <= 0xF; --i) {
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out[i] = sector_id & 0xFF;
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sector_id >>= 8;
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}
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return out;
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}
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};
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} // namespace Crypto
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